When Eye Floaters Are Harmless—and When They Signal a Serious Problem

A sudden increase in floaters, seeing flashes of light, and obstructed vision signal an immediate need to seek medical care.
When Eye Floaters Are Harmless—and When They Signal a Serious Problem
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“When I look at things, it feels like ink is spreading in front of my eyes, and I can’t see clearly,” Wang Meng-chi, a member of the American Society for Cataract and Refractive Surgery and director of the Taiwan Trust Me Eye Center, received this message from his wife on the phone one day.

Wang rushed his wife to the clinic for an examination. It was discovered that she had acute vitreous degeneration, which had pulled on her retina, causing a tear and pulling on the blood vessels at the same time, leading to vitreous hemorrhage. He immediately performed laser repair on her. After two weeks of rest at home, Mrs. Wang’s retina gradually stabilized. However, the floaters in her field of vision were still noticeable as the blood clot from the hemorrhage remained in the vitreous humor, leading to slow absorption. The floater symptoms improved after about six months.

Why Does the Retina Tear?

The appearance of such spots or threads drifting in the visual field is a phenomenon called floaters. The most common cause of floaters is related to vitreous degeneration, Wang said.